Chaos Space Marines are mighty warriors of the Adeptus Asartes who have betrayed the Imperium, forsaken their vows, and become monstrous warriors who answer to nothing but their own dark desires and the Chaos Gods. These renegades and traitors are terrifying warriors who are amongst of the most potent and terrible of the servants of Chaos. From hidden bases and defiled space craft they wage war against the Imperium that they once protected. Fell whispers have begun to spread that warbands of Traitor Marines have been drawn to the Expanse in search of something that might be an apocalyptic weapon or a terrible fragment of lost. These fallen Astartes have assumed dominion over the lesser servants of the Dark Gods like proud and bloody lords who demand that lesser men bend their knee or be subject to torment and death. If this proves true, the danger these Chaos-tainted, superhuman killers represent is a terrible one, and no world or domain of the expanse is safe.